Alarm system for space heating appliances

Abstract

A housing for attachment to a space heating appliance and having a terminal assembly receiving a two conductor plug. The terminal assembly is positionable arcuately on the housing and includes a contact closed upon expansion of a bimetallic coil. The coil additionally drives a temperature indicator. A signal generator unit is remote from the first mentioned housing and is in circuit therewith via a two conductor cable.

I claim: 
     
       1. An alarm system for signaling the presence of excessive surface temperatures in a fuel burning appliance, said system comprising, a sensor assembly including a housing having an annular outer wall, a bimetallic coil having a radially outwardly turned end segment, a terminal assembly adjustably mounted on the housing outer wall and including a set point marker and a contact for location in a path of travel of said end segment of the coil and contactible by said coil end segment and through which an electrical circuit is established upon expansion of the coil during an increase in the surface temperature of the appliance, a pointer rotatably mounted on the housing and including a plate defining an opening through which said coil end segment passes in an unrestricted manner for imparting movement to the pointer without obstructing coil expansion,   a signal generator unit including a second housing for remote disposition from the sensor assembly, a signal generator, a power source, and   conductor means in circuit with said terminal assembly and said signal generator unit to activate the signal generator upon closure of the terminal assembly contact.   
     
     
       2. The alarm system claimed in claim 1 wherein said housing includes attachment means for housing attachment to the appliance, said attachment means including a magnet defining an opening for the reception of a fastener engageable with a housing supporting appliance.